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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d41fec25f47787b7875e6c951622f6065ebc1f1f7a5e70e29a3aa2591a6f20f' 
  AND token = 'Zfteb007YNHOBaz6ZjmIrtgv33qbOIE8kWKfsKD4M6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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