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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f7e1bde6c55f850ef30c56d24ed3620e3b30547ebc1a54b6e167dbb33af31f' 
  AND token = 'rqgb6E4H757L52VZs8ZcqgHSITZrFSEQVNCyYKwnXUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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