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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475b0290c05078bd43e8f17db6904b7786ee31538f8e59e2e5e41e1a76bcfd11' 
  AND token = 'cF5WHGDnjhGNjznnrhvyP6gzumvs2H3WT6Fz5pWVPeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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