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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831e2c6e60c84e605a630fb63874c4633c82da82596a4e2e366ec4b905aea42c' 
  AND token = '2+sm+hti1uXFS2ZerigPXAjooIwI+gsgiq4CmbOQPf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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