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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0244c9bd486acdd09799351234d65f4fd22207c747335c6912aa4b6409bda68e' 
  AND token = '7jVG/3k3nyooTAWU2G3LDDoj/1Vxmh14F8sWREk/JnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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