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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c28d94a56539f21a8ee5c1c749be5fbfbc88cbba6792fa9504468156600dc1' 
  AND token = 'UDJSurJs80t20/L3+Zro6QslSJ4Q3tzhJuoL2UUlBFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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