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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34af8734b4add5c74e3279e7f3f23303709d194a7a5df5afabde8c988418a3e' 
  AND token = 'V0R7vrrEt4zZSYtI4zsxMmualQSKp3lBzauoz1ooNa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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