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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d63da332ecf09865dacdc6352ce7b1cf7d5df8a95e079b62a6d895e5e7edec' 
  AND token = 'ql+tOVtq5QLjEYkNIP+MyqR2coFOHMDuVPa5TaLGx0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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