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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62f32c776cd9ac06e06ac9cb4f46e58bbd53ceeab7298fe1df72a95baa9ec7e' 
  AND token = '1HLZd67DrybeH3McWlKPjg/thfVLz6yqsa3CcOMzx3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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