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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d29da70f47627d8dcfb1c1ddaf64cf781e142d39ccfab3088503630f1999ef' 
  AND token = 'uAIyUZ505CKzi1a/NbCLG9XaNR5gbtnep4FOkD1fX2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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