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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c495f898c1714d28e1977e3917cfdf46846c9998839055def43deeb2cc5211ba' 
  AND token = 'T0QDQXK15R6THsUpdVmyWbhlQrQMOdl2ar1AbT7qzwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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