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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708a08a1a61bdc5ee10cc7a7e401e0982484a996cd98d28e9cd13e174646be4' 
  AND token = 'Koyw8BiW742WV41OBQmvrZKoyf7UQjLaYN8DzXK4vtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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