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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5ba98a4614d58289c4c439e13306ac0f2d56d119c83bc6232dcb1a5233c1ec' 
  AND token = 'rBOkkXW9osyDkopWYIxpGi9UKQXmiC4sQvMJK1Jzsjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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