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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ab4042198a7790cfe0fbbbf5105149fc4e5c1e403c730ddcbc3aa6ffe7afcd' 
  AND token = '9XgJ4SR1hy+o+z2LUVZRD87iA3dZ/iuas+VobsJLoDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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