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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1502256b948152d1ba5243d755fbcaebb28286ebb8cce203ef374e9cc0c9118' 
  AND token = 'VsyQXGvs+e2hqtVP6q00FIOscVEnYl+/EBHx867W4Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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