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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93276bb73e8265acab53b3c890eff00aba0e1caadc79430afcd8dc37a43b0342' 
  AND token = 'mV/z7rPpr3JtYjvrPPFy6jIWgYf3cXUhjOC3PcHzcZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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