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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3011d02b5c55aa98eb5f2b592452efa1f8db1feea6c286c1be7c2a7d255f65' 
  AND token = '/ayxc70AhYILLDxqHKB5WggRGqnfvHFSeBERj7gkVSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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