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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c1d1d73ee5a697e06dfb0dc2b86ff20570d8dcc1ca92c40bd2c159c5617bd6' 
  AND token = 'cRynaA2iQDKgaIvrXy/k3szlnHCyVkkxIaytHUUUYXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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