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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617f51b65a762bed73aad467d204e3e41dddb422df6a3ba31a59f28ee05adb9f' 
  AND token = 'EufvS2eG4G78acVM0AkUUzuA7XZUYHT0lPPsfj3j7bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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