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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12365d820c50642264a25b3f795695663558c839593175f152c3ecc69d1eeb8a' 
  AND token = 'Bliy6EOKU3HIpIcgm0+LAO7V5wxjCemrP0vwu6egsS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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