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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cd2603a2638f380b476e36757cef1b5743f517ee2df9a06d66430275f7f7d0' 
  AND token = 'hIDVc4TX7l7zti5EVXoicGw8cAHEcZEYDc8Bw/aG9u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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