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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b7ef91661eec559ca3dae09e605525a828c9a5f3ca65706a7752df85030a06' 
  AND token = '1Et7clbKZbGgRw8bt/H9v1b7oIXqwC+/nHDnc4Hnkhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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