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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e4d7651324c0682ce001ac8930402990bd8011e1500964da0f1dfa6b30f30b' 
  AND token = 'cr0Sps1xX5ZXapAuoQWbeoZKtbXdwEic0cZjtYXdFek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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