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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1436d59bc3254c5a559265ab6925910e24d9d7672245bb3b465683d58ee214fb' 
  AND token = 'CJX79SaK6n4GhokrxB2KV+1O66CeOX8hOr60PckIcOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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