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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88869c0d12958b42c43ff438b24a894cd782c1c41f923f702cf99ee887b9b79' 
  AND token = 'gRRlqOpXmvoy8W5bV13nDZ/UhW89yLCvWBHp3nwPmpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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