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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb0b21c83ae262faa1e1a642e2efaa0843d8ce0682f6652d1ab1b6b82a7965d' 
  AND token = 'pdZb48jkAhwt5v5oEY+v2ZB033P0hQoxeKH949soCyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}