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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282ac295051605e22198f64d0707065957fe1026d0e5f565a04d9aafeb07336b' 
  AND token = 'hQFzIB72PKh8cz3kTTrMzQz4j1+NnbQfnzXRWcE+bq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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