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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b9ae4e960cbe5413e1dd053faf4f6648b3585ab8cec3ea63d5f328b3a41c1b' 
  AND token = 'u6r0lbHDDf6vP4IHl3GwrSc0OBByA5mlsetnb5e0uTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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