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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb389c0226a9d620125b83f49d47f761884c2d4dc0ce3c8ce5243b759728eb9f' 
  AND token = '3+Cx3Q0UZ4KlRWmyFC4z9l5xF3YZPgRJYeqPl2fenPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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