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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2127d8643e5519ea58dac7e2094cc46ba87734a0682c2267233c5912f7417888' 
  AND token = 'XzWgWzUh8TU3K0AYP8WxVWdrmFobc/0lGMyj5jskU68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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