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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51ec5ba34f01a61a8f4cbd5c3da99aaee219ec7711077f148215bb146c124fa' 
  AND token = 'iALyx4QZSAECMV2dGubQlb4xw9gzkfhlPl1g/DQerLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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