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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169b254dd2fa2e4e353533edc4606783228bf28aa0538d32b371cf6b7072258a' 
  AND token = 'wK92aPI8mZtelxWchlMXBCUDptFU2xmbEhSofIyaRbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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