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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff679469eee4f6b2d6e375761438069cbf241ce091f181e1f6db99b3fea8ed79' 
  AND token = 'mD1P8nQ04vtALUhL+WF2WHamgN353awgciv9mMZO3ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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