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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e19f4df6917e688b631124891c1e087d5027799b05f6091a58a635b631fdfca' 
  AND token = '6swuO5YAzOkVCny35Zm12GCQfNq+ICe7Us61THlswpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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