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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76f1a40c1e14c2ac0dfc8057553721e7b40d892d2e43282c4e045eaadbeeee9' 
  AND token = 'LRH5nKWsrPOi5H+IUhkPeshRCKDWtIGshwdJTTNIshk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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