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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa60c2ed10a533b0b566650f391df880f8ab7d3f67236ad47c0f0dd1a3a4fb49' 
  AND token = 'Lf0xbX6jNdLgE1syIE+ECGd8Xof5omTPsUjKFP/P0QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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