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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309fa772314403c0929bf07a88dc4d664452fd100d8a794cddd920b1d8e5fc8e' 
  AND token = 'CdbDodkRatY/kClkWgxfxEPTdyHK8hhZPVH6WgX8J20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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