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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5b924d2444237c3418b87aea936fdb782c4aeb128ffadb5c11bba6e182a7b3' 
  AND token = 'g8sC8f3nopizJ6RoLY06/6dyyAa5psIoL3wp5szkl1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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