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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaf8666d92d312e113d10031efeb8eba2a0ee538aca03bc429e08eafc4b65df' 
  AND token = 'RJ53p5HCEfjU6JE8SHYCNnHwcDt2xscSc89FPhYEgV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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