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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde2805fbeb5243028d1a7050eaa6bd47e99be4061667ed3ca886a582f64e51f' 
  AND token = '2mp7KHFnuw12IM4R4kzFYCnBlrVzC+mbxN027kn6qDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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