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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9d9c1d211ee1a2e8e2e9df1a0c86617d9f0be9469bd86f473be404c841f065' 
  AND token = 'oqeMvUSHr1n5Zju9N5Dqzyhil66j5qmNMr/+QOrHmRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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