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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee85dce764377f2591de4475558f8e0a70baccd448342fd1807a77293a29e7d' 
  AND token = 'kGPYjp/ZIeaPF1zVeboROXE2n0GIK0fmC47UauS3sbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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