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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb7e66b738ed0571b00ba1e4c83fd46dd7a5b8288965f7b8a5818fa0bdaa500' 
  AND token = 'dgyXHMB+5e1kKnq4N2pbHFtk0s9RhtiLYO/bnY0Kdj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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