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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0077079d601704d752a5161e9183ba2ac714b46860179568e8da7dfed6aaa8bf' 
  AND token = 'ahqOGbzkuqJsacjM+pB/PcybNv/z0oLh+QJ0Gh4LQvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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