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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0ad1c21cc203d8d7a170a0bf56b2f3c2b8b1d153995a3ed6e2699a271e4ad3' 
  AND token = '5pzx/noFcAY96acLFK5vV8QXwkcbaFn0Eni9DjvOswU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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