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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302fbc3a4df2e1ebcb1cb5f9a211902d3e8e6f2f0ad8ff868f816953fe8fdeff' 
  AND token = 'JHyQ22b2JeRDeMqrOSuT+cemvjgjheFg3HBKZEsNv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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