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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff29a43efb2d4abf0dcf0be3b15223365d9d0955d6c5fb7cdcc09206e5164ab' 
  AND token = 'MV3VdfWCTBeHZC2r7dlPgL7oaxHocIhvQkWYF256z+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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