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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773325dd66d53d8c97fd4d20b8455c6f8a9501ac59578b29cbbb0e1a30ac087c' 
  AND token = 'lcK9RLkjWoWCcNIiz7hnpTGxrMXw67EH+iaaPw3W6+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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