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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce55e49dd081cd3ca210120413756c199c70c316f86548b90d5f79e67036f984' 
  AND token = 'D8Lli4IAhTZPvlyDVBKZ4QrMIvGpoVipmF1VOQdyLFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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