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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8639d40d387124e01c1482ad3c71f4ae5162038ae9ddc44573582a9080f5c1cf' 
  AND token = '4iy0weZfgxJqVR7zOJox/r/9HTliDl3khSqJiNunC1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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