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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb02e4fb1317ce353892c2d908ad2c38da7a45c7336b17a833568f025f8ce06' 
  AND token = '+78D+e8EOBWj06efSzob4L2i6MG1Z7+RZ1WLW69bmLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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