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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98b3793bc419dfe7d605f0356cb2730d91901eff7edaf40e5937d345ac87317' 
  AND token = '8ep3V0Aoy9PagEXZgvLlDCwy/ss5tuNlvNw7ez5yxIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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