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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83bfe5589b419b40e3090f8de7aa6e937d188eaddfa59f875c5561a30a3ea96' 
  AND token = 'xYIcuOhw5RcyIkFr63F2R5l7Cl1LElGnWhTsQUHHZR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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