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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe28f65a67fa3e53ae723474e6bb980d6188691e48dfdd62d13e810dddf9683' 
  AND token = 'XZQD/NGcSnQ2EH/oTB2RwBRWfgjeKZwe4gz/Znr0GBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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