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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae79840b04e2877ee508015f9ef2bcf648477a9069fc9307fcf4a5c53db7b43' 
  AND token = 'g5/6ebPo9qeOuUgCZNKdYPpzJk7KYuSRSe4Q1KZ4xzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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