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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e96660bc8c91377d69708ef634e5e390ee74ee49a90b65ae082c6be01070fbc' 
  AND token = 'vDHwjSoQeigJjDKCoJrNxFgXhaCfoJ3ooSJ9Qnc0DG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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