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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656d707ef824577625df7ac1e02914179a397a43d34d798ead5874a2d3acf928' 
  AND token = '2pM69C4IbepGGqMPsTKJs+mRbZRMQPcL+jWnHjJeVHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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