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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af3e7677bb2e1b32745ba9fd46bfeaa6261f62e35c2a44d37d84bdee94a9879' 
  AND token = 'O7u8wlWadWtwjrGKXN9RWP74m5Z/isUrT0KpJr212Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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