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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ea17c4f69bc91069804807aeb42134a2960ed33e2d418e3d80b7e1763de694' 
  AND token = 'MQlGkNYOwxxELcofe/cnIVvxwBB0UDSl/oX0g2epaRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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