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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d03526346ecdfab0a6c7274f4ec2bea71a2e032b605eabc0872d803c999c02f' 
  AND token = 'Ys8GQTvk2Ygd6ouTZ1LqOHt9pi5693yhbHxmJUZ9oxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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