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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90be0348d789ca39deb6a22a875788e6509172e48604fe1a32833f776f6fd4ea' 
  AND token = 'rlamM2DzTvRjRnah+N1TdZMzQOZ7B+RHP8Nphm+Z/Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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