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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d23a73def3daef49eaed3aed295f9cd58b2a8a3a7d5acc3b2a2e8feaca7e8a3' 
  AND token = 'Jas9mY+vYNmpD9iBFf5PnCeX8VjGpw1xwhTpO3E3Zbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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