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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60570e32cbf064019eed7d94d9adc93c4502fe9ede77706947b7c6e32e3dbf97' 
  AND token = 'gQzFyH29vuFkrKWyF7U+AY/2Vy9URQ34mK7i3KAABeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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