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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31a108d8184614e4b6d7cc25c50200647f5917573863ee3f07cce86735c56d3' 
  AND token = '9v9Rhzy+c0oDf2D9MaUf0GxPxenGM/k7FOxDu523u0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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