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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e1ff165e5ca171bf315914d311dbc5329367121835e19b315e777f6a6dd71e' 
  AND token = 'yx7TF9lp4JrewDW437WK9lYpMtZQ7SoyAgWnOyHu8hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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