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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96f7fcffab76e5abd9bf5f4818026f3f2d62994cc98e126a37560707358cace' 
  AND token = 'xi7zS+WlBn9UEHdGASRTOVhCOwEe33WoHEIs0K4aUmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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