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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee87df009ec4c2d91af9003a5036283fb847b80a97a2ed6f68a3c0a8d6304870' 
  AND token = 'K7miBu9SkNl3mwZuVpRNT1Rc9TxkIrlrO2xPxNuzUg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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