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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8b3abcdc05e2e7c47fe821ddaa216762ac34634c1053dc7495f838fb44dfa6' 
  AND token = '9WoHBOIaa73z+4GfWRUJLsLR27Tde/4lTK6Y9+EtZyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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