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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16554b0fca84b10a4d41b72cd76a4053bf3e74d180e66eedecccb303e1c7203' 
  AND token = 'kw0QGoymo//C8rah4awnQ7X2xF7mD1KF9/h5IwfMiF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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