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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f14f6799d061c2b1c2b28221188cd94dd2cd1a3b4454544d0f97bff69e7e0be' 
  AND token = 'kCa/4Q44rPBtuKSLSnkYiOxkUf3LG2OCEPv30qWlPN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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