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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc62e14ae1f40b258f34ef503363ac16183f8611da4908088e5a9d74752d6af0' 
  AND token = '+k1sihd4Bs6UMpUM+f8c1tVT4cioC7DxDvBuUuTrTiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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