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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c23b4d23c6c31113461c2eb267f4ab0e867f8d56d6b854dcfdf4f9c1a7fabfe' 
  AND token = 'IN8CP8k5ox2huo4iHMnzh3qMHMO7rt76/A8gFqorXYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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