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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0207d5930dd93dc400214e78b97e56d29cfed119d8155e1672aeea374049a9e2' 
  AND token = 'VFcS8mVOVHIg+UTQPXountGw4FWY8EdVf7x0+JPplH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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